The modules’ eight digital inputs (12-bit and 0.1% accuracy) send eight different error messages via e-mail or fax. Applying voltage to the digital inputs enables text messages to be sent to up to four user-designated receivers. This ensures security and accommodates preventive measures with designated phones (e.g, passcodes and lockdown). Up to four outputs can be connected to TO-PASS® via SMS. User-defined text switches digital outputs on/off; TO-PASS® texts a confirmation upon command execution.

Beyond factory-default DI/DO On/Off commands, users can customize command text (e.g., Lights On) via dedicated configuration software. Inputs and outputs can be fine-tuned — set scaling from 0–20 or 4–20mA, or the base rising/falling edge on set points. A text then notifies one party if thresholds are met and another if values are too low.